In case someone is like me who just assumed it’s not possible and never tried to look it up before.
When playing a DS game (or GBA apparently), press Home, then hold Start and use up and down on the D-Pad to change the brightness.
No need to exit the game. Neat.
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Dude. Seriously?! I STILL find myself making sure to set my brightness right before launching the game. Thank you
Yeah, this is handy and I always liked something like this but for my DS Lite 😅